export {}
// 我们接下来在这里写 TS 代码
let str: string = 'hello ts'
str = '80'
console.log(str)

// 定义一个number 类型
let age: number = 18
age = 80
// age = '18'
console.log(age)

let isLoading: boolean = false
let nullValue: null = null
// nullValue = 123
let undefinedValue: undefined = undefined
let symbol: symbol = Symbol()
let bigint: bigint = BigInt(123)
console.log(bigint)
